NJ88C33

2

PIN DESIGNATIONS

Description

Pin

Name

V

DD

RI

S/D

SDA

SCL

PORT

MOD

FI

GND2

FVN

GND1

PD

C

LD

Pin

No.

1

2

3

4

5

6

7

8

9

10

11

12

13

14

Supply voltage (normally 5V or 3V).

Reference frequency input from an accurate source, normally a crystal oscillator. The input is normally

an AC coupled sinewave but may be a DC coupled square wave.

Single/dual modulus operating mode selection input. Single modulus operation is selected by driving

the pin low. 'High' selects dual modulus mode.

select single or dual modulus mode under bus control.

Modulus control pin. It is high in single modulus mode but switches in dual modulus operation. In dual

modulus mode, MOD remains low during operation of the A counter until A=0; MOD then remains high

or push-pull output.

Frequency input from a VCO or prescaler. The input is normally an AC coupled sinewave but may be

a DC coupled square wave.

Dedicated ground for the FI input buffer. It should be connected to the VCO ground or the prescaler

ground, if used. Any noise on this pin will affect the performance of the VCO loop.

Open-drain output from the N counter.

Ground supply pin (global).

Tristate current output from the phase detector. The polarity of the output can be programmed via the

Voltage doubler output. The operation of the doubler can be controlled via the I2C bus. In applications

where the voltage doubler is switched off, this pin should be connected to GND1; a reservior capacitor

should be connected from this pin to GND1 for applications where it is switched on.

Open-drain lock detect output - requires integration if used.

OPERATING RANGE

Test conditions (unless otherwise stated):

PLL locked, RI = 10MHz

Supply voltage

Ambient temperature

Supply current

Single modulus

Dual modulus

Standby mode

Standby mode

V

°C

mA

mA

µA

mA

V

DD

T

amb

I

DD

I

DD

I

DD

I

DD

2.5

-40

Conditions

Symbol

Min. Typ. Max.

Unit

Value

5

2.1

2

1.0

5.5

+85

3.0

3.0

1

1.5

Characteristic